Air-compressor



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..WWWWMWIIIIIIA Il Patented May 3, 1892,

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B. F.' TEAL.

. AIR CDMPRBSSOR. No. 474,034.

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UNrrnn 'STATES PATENT ,l

BENJAMIN FRANKLIN TEAL, orCHICAGO,ILmuoIs,

Ain-COMPRESSOR.

SPECIFICATION' forming part of Letters 'Patent No. 474,034, dated May 3, 1892. Application filed March 80; 1891. Serial No. 386,975. (No model.)

To all whom 'it may concern: Be itknown that I, BENJAMIN FRANKLIN TEAL, a citizen of the UnitedStates, residing at Chicago, inthe county of Cook and State of Illinoisl1ave invented a new and useful Improvement in Air-Compressors, of which the following is a specification.

'lhe object of my invention is to provide an improved construction of compressor for air and gas .wherebya compound compression shall be produced in asingle cylinder.

To this end my invention' consists in the general construction of my improved device;

and it also consists in details of construction and combinations of parts.

proved compressorby a View in sectional elevation with the piston-rod-broken away.

lA is the cylinder, which should be provided, as shown, with a circumferential chamber 'r for the cooling medium (water) and in the head A of which is a suitable number of in- Vo in the cylinder-head.

B is the piston, comprising ahead B and a trunk B2, the head being suitably packed and fitting closely the bore of the cylinder .A and -having the piston-rod B3 connected with it and the trunk passing through the head A2 of the cylinder, where the latter is properly packed and the trunk closely tits it. A ringr 'n loosely surrounds the trunk below the cyl 'l he trunkBZ, the piston-head B'and cylinder-head A2 forn1,with the cylinder A, an annular chamber C, and in the end thereof nearest the head A2 is a spring-controlled Vor balanced check-valve min a bear- 1n g Z, from which leads the outletktothepoint of utilization or storage of the fluid compressed by the device, the spring of the valve m'merely serving to control it to bear against its lseat when not forced open bythe opera` tion of the piston. y `In the piston-head B is a desired number of lnwardly opening check valves q', which should correspond in number and construc.

tion with the check-valves q, and from the chambers t' of which ducts h lead in'to thcannular chamber C.

through the ducts h. The 3.000111 all 'inn' dl'awl" SllQWS Ill lll).-

p b a thereto, though it will be understoodthat my improved .device is equally useful for conlpressing other forms of .gaseous fluidthan al r. The first outward stroke of the .piston by the suction @Heet it exerts upon the valves qopensA the latter and admitsair into thceylinder A, The succeeding inwardstrokecompressesthe air vbetween the cylinder-head A. and the piston-head sufficiently to cause opening o f the valves q' in the latter andpermit the introduced air to enter the annular chamber C Each succeeding outward stroke obviously notonly eects introduction into the cylinder Aof afresh supply of air, but compresses that previously forced into the annular chamber' C until the pressure or resistance at the back of the valve m 1s overcome, when the pressure .in the chamber C opens that valve and escapes to the outlet k, and cach succeeding inward stroke of the piston as obviously effects com pression of the air into the annular chamber by forcing mto it the air admitted through thecylinder-head A by the preceding outward stroke. flhu's, as will be seen, the complete compression 1s superinduced byboth the inward and outward strokes of the pistomthe piston and vtrunk being so proportioned that their eEective areas shall produce approximately the same total.

` 1. In a compressor for gaseous fluid, thel combination of an outer cylinderand a'piston therein, the latter comprising a trunk and a head formin g,witl1 the cylinder, an initial compression-chamber atthe face ofthe head op,- posite that carrying the trunk and between the cylinder and trunk, an annular space affordinga final compressiouchamb'er, the said piston loperating by its successive strokes altex-nate] y to introduce the gas atnorinal pressure into the initial compressioli-chamberand 1o between the said chamber and its outlet 7c and eontrollably communicating with the inlet end of the cylinder, and inwardly-opening check-valves in the piston-head and adjacent cylinder-head, the whole being constructed and arranged to operate substantially as and 15 for the purpose set forth.

BENJAMIN FRANKLIN TEAL. In presence of J. W. DYRENFORTH,

M. J. FROST.

It is hereby certified that in Letters Patent, No.l 474,034, granted May 3, 1892, upon the application of Benjamin Franklin Teal, of Chicago, Illinoisffor an improvement in Air-Oompreseors, en error appears in the' printed specification requiring the following correction, viz.: In line 2, page 2, the word initiapl7 should read jimi and that the said Letters Patent shovd be reed with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed, countersigned, and sealed. this`14th day of June, A. D. 18.92.v

[SEAL] CYRUS VBUSSEY1 Assistant Secfetary of the Interior.

Countersigned W. E. SIMONDS, t

Commissioner ofPaftets. 

